Effect of shielding gas composition on gas metal arc welding phenomena using rare earth metal added wire [REM 添加ワイヤを用いたガスメタルアーク溶接現象に与えるシールドガス組成の影響]

Journal article

Authors/Editors

TITINAN METHONG

Strategic Research Themes

Materials Processing (Innovative Materials, Manufacturing and Construction)

Publication Details

Author list: Tanaka M., Methong T., Komen H., Shigeta M., Kataoka T., Matsushita M., Kozuki S.

Publisher: JAPAN WELDING SOCIETY

Publication year: 2021

Journal acronym: Q. J. Jpn. Weld. Soc.

Volume number: 38

Issue number: 4

Start page: 438

End page: 447

Number of pages: 10

ISSN: 0288-4771 / 2434-8252

eISSN: 0288-4771 / 2434-8252

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85100269432&doi=10.2207%2fQJJWS.38.438&partnerID=40&md5=b78bd01b89dabe8d0742cd5edb202753

Languages: Japanese (JA)

View on publisher site

Abstract

In this study, to clarify effects of the rare earth metal (REM) on arc phenomena, observations of an arc appearance and a metal transfer during a gas metal arc welding using a REM added wire by a high-speed camera were conducted. Moreover, temperature measurements of the arc plasma were carried out using monochromators and high-speed cameras. As a result, the spray transfer mode was observed during the welding with the electrode negative polarity using the REM added wire when the shielding gas including CO2 gas was used. The globular transfer mode was obtained during the welding when 100%Ar gas was used as a shielding gas. These results showed the reverse tendency compared with a conventional gas metal arc welding using the electrode positive polarity. Moreover, the droplet frequency increased largely in the range of 220A to 260A during the gas metal arc welding with the electrode negative polarity using the REM added wire when the shielding gas including CO2 gas was used. From these results, it was suggested that the spray transfer mode during CO2 gas arc welding and metal active gas welding was obtained by two factors. One was the operation and stabilization of the hot cathode by the welding with the electrode negative polarity using the REM added wire, and the other was the increase of temperature of the molten metal droplet and constriction of arc and arc root by the thermal pinch effect. © 2020 Japan Welding Society. All rights reserved.

Keywords

Imaging spectroscopy, Polarity, Rare earth metal